[pjc50]

All the retro platforms were proprietary, though? Can't get much more proprietary than Nintendo.

Cortex-M0 is very comparable to a 68k with 32-bit registers. http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc....

[zzo38computer]

Many old Nintendo systems are now well documented and you can potentially make a fully non-proprietary hardware clone and software tools.

[AnIdiotOnTheNet]

Retro platforms were current technology. If I'm going to use technology with several orders of magnitude less power, then I'd at least like it to be open, is all I'm saying.